Chronotype but not sleep length is related to salivary testosterone in young adult men

Randler, Christoph; Ebenhöh, Nadine; Fischer, Arian; Höchel, Sandra; Schroff, Christina; Stoll, Júlia; Vollmer, Christian

doi:10.1016/j.psyneuen.2012.02.008

Cited by 73 publications

(57 citation statements)

References 26 publications

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“…However, when pursuing this idea of the synchrony further, evening types in our society might be more advantageous in having sex, as this study shows it happens at their optimal time of day -late evening or night. This is in line with studies showing that evening types have a higher number of sexual partners (Gunawardane et al, 2011;Jankowski et al, 2014;Randler et al, 2012).…”

Section: Discussionsupporting

confidence: 92%

Chronotype, gender, and time for sex

Jankowski

Díaz‐Morales

Randler

2014

Chronobiology International

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Section: Discussionsupporting

confidence: 92%

Chronotype, gender, and time for sex

Jankowski

Díaz‐Morales

Randler

2014

Chronobiology International

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“…Lastly, the recently reported correlation between circadian preference and salivary testosterone in adolescent university students supports a physiological underpinning of the discussed association (Randler et al, 2012). When considering the vast literature on the effects of free flowing as well as artificially induced levels of testosterone on the occurrence of aggressive actions, a significantly elevated level of testosterone in evening-types could predispose these individuals toward externalizing behaviors (Mehta & Beer, 2009;Montoya et al, 2012).…”

Section: Evaluation/integration Of the Current State Of Researchmentioning

confidence: 56%

Chronotype-related differences in childhood and adolescent aggression and antisocial behavior – A review of the literature

Schlarb

Sopp

Ambiel

et al. 2013

Chronobiology International

102

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Eveningness has been found to negatively affect adolescents' sleep and daytime functioning. Furthermore, eveningness is associated with greater impulsivity than morningness. Externalizing behavior could be chronotype-related, implying that the alteration of the circadian rhythm itself is connected to aspects of emotion and emotion regulation. The present study investigated chronotype-related differences in emotional and behavioral problems, especially aggression and antisocial behavior in children and adolescents. We conducted a comprehensive search via web of knowledge (MEDLINE, web of science), EBSCO, Ovid, PubMed, Google Scholar and PsycINDEX using the keywords: chronotype, chronobiology, morningness, eveningness, owls and larks as well as diurnal preference to fully capture every aspect of chronotype. For aggression we used the search terms: aggression, anger, hostility, violence, anti-social behavior, conduct disorder, oppositional defiant disorder, delinquency, social adjustment and externalizing behavior. N = 13 studies were included concerning chronotype, childhood, adolescence and antisocial behavior. Results showed that children and adolescents being E-types were more affected by daytime impairments. Additionally, behavioral and emotional problems as aggression or antisocial behavior were more pronounced in E- than in M-types. Our findings support an association of eveningness and the impact of aggression on children and adolescents. Longitudinal investigations should be conducted in order to insure causality of the effects in question. In addition, the elevated vulnerability toward aggression in evening types demonstrates the need for prevention and intervention programs that educate youths in proper sleep hygiene and evoke an awareness of the consequences of a habitually diminished sleep quality.

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“…Testosterone appears to be the best candidate for such a hormone, and its relation to evening orientation of human males has been already directly and indirectly tested in several studies. Although Piffer (2010) and Gunawardane et al (2011) did not find evidence for significant association of eveningness with such markers of masculinity and high testosterone levels as low voice pitch, shoulder-to-hip ratio and hand grip strength, the direct measurements of testosterone levels reported by Randler et al (2012a) showed that eveningness but not sleep length is significantly related to higher testosterone levels in young adult men. Moreover, İşman et al (2010) found significant relationship of eveningness of male and female students with low ratio of the second to fourth finger lengths that is believed to be a proxy marker of the effect of prenatal testosterone on the fetal brain.…”

Section: Proximal Mechanismsmentioning

confidence: 81%

What were “owls” doing in our ancestral photoperiodic environment? Chronobiological account for the evolutionary advantage of nocturnal lifestyle

Putilov

2014

Biological Rhythm Research

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Since evolutionary process is slow, the human brain was adapted to the ancestral rather than today's environment. Therefore, genetic predisposition of young people to nocturnal lifestyle requires explanation. The pattern of age-and sex-associated differences revealed from self-reports of 2054 native and non-native residents of Turkmenia, Siberia, Yakutia, Chukotka and Alaska suggested that late bedtime preference might has evolved under sexual selection pressure. Moreover, simulation of experimental data on prolonged wakefulness indicated that differences between people preferring early, late and extremely late bedtimes (n = 39, 53 and 38, respectively) on wave-forms of their alertness rhythm can be explained by a relatively small circadian phase delay. It was hypothesized that, due to sexual division of daytime labour in ancestral societies, the late bedtime preference evolved to solve an adaptive problem of creation of early night lek for displaying throughout courtship various human-specific behaviours advertising high cognitive, music, gymnastic, artistic, language and humour abilities.

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Chronotype but not sleep length is related to salivary testosterone in young adult men

Cited by 73 publications

References 26 publications

Chronotype, gender, and time for sex

Chronotype, gender, and time for sex

Chronotype-related differences in childhood and adolescent aggression and antisocial behavior – A review of the literature

What were “owls” doing in our ancestral photoperiodic environment? Chronobiological account for the evolutionary advantage of nocturnal lifestyle

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